. 2023 Feb 14;14:1124750. doi: 10.3389/fpls.2023.1124750

Table 1.

Lettuce cultivation characteristics of three independent experimental repetitions in April (1), May (2) and September (3).

Lettuce cultivation characteristics	Experimental repetition	Lettuce cultivation condition
Lettuce cultivation characteristics	Experimental repetition	Without polytunnel	Polytunnel with antifog	Polytunnel without antifog
Daily light integral (mol m^-2 d^-1)	1	7.23 ± 1.91^AB,a	5.81 ± 1.63^AB,b	5.33 ± 1.41^B,b
	2	9.01 ± 3.34^A,a	7.10 ± 2.36^A,b	7.07 ± 2.22^A,b
	3	5.97 ± 3.41^B,a	4.30 ± 0.31^B,ab	2.10 ± 0.21^C,b
Photoperiod (daylight, h)	1	13.37 ± 0.41^B
	2	15.14 ± 0.55^A
	3	12.67 ± 0.60^C
Temperature (°C)	1	22.61 ± 0.54^a	25.29 ± 1.61^AB,b	25.19 ± 1.43^AB,b
	2	23.04 ± 1.17^a	26.06 ± 2.26^A,b	26.28 ± 2.38^A,b
	3	22.57 ± 0.80^a	24.07 ± 0.78^B,b	24.05 ± 0.77^B,b
Relative humidity (%)	1	42.98 ± 3.90^C,a	86.30 ± 8.77^B,b	91.79 ± 8.89^c
	2	46.67 ± 5.76^B,a	90.43 ± 5.75^AB,b	92.13 ± 5.14^b
	3	56.52 ± 5.67^A,a	95.48 ± 1.82^A,b	95.48 ± 1.67^b

Lettuce was grown without or under polytunnels with and without antifogging additives. Data are shown as averaged values (mean ± SD) monitored continuously over the experimental period. Capital letters indicate significant differences (p ≤ 0.05) between the three repetitions within similar cultivation conditions. Lower case letters indicate significant differences (p ≤ 0.05) between cultivation conditions within one experimental repetition; no letters indicate absence of significance.